Incuse devices changes the whole ball game as they are opposite the thought of hub doubling. If they are incuse and the coin experiences slight
Machine Doubling, this enlarges the devices. As far a hub doubling on incuse devices, I have not seen that yet, just
Machine Doubling. I'm sure an examples will eventually turn up, but most of the doubled dies on the single hubbed dies has been on the central devices and not on the outer devices.